Anterior Veins:

This vessel originates at the apex of the heart and runs superiorly along the anterior interventricular sulcus (next to the anterior interventricular artery).

Near the left atrium, the great cardiac vein veers to the left and enters the coronary sulcus (= between the left atrium and ventricle), where it extends to the back side of the heart.

One or more left marginal veins typically merge with the great cardiac vein as it traverses the lateral ventricular wall.

Small anterior cardiac veins also drain blood from the anterior right ventricle directly into the right atrium.

The anterior cardiac veins.

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Blood is removed from the lateral and posterior right ventricle (and atrium) by the small cardiac vein, which travels to the posterior surface of the heart in the coronary sulcus (= between the right atrium and ventricle).

The small cardiac veins.

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Along its path, the small cardiac vein receives blood from one or more right marginal veins.